A Study on the Development of a Caddie Education Program for Golf Club in China

Du, Xin-Rui,Kim, Sung-Jun,Cho, Sang-Woo The Korean Society of Applied Science and Technolo 2019 한국응용과학기술학회지 Vol.36 No.2

The purpose of this study is to present a caddie education program that can improve the performance of golf caddies in China by comparing and analyzing the golf caddie education programs in South Korea and China. Caddie education programs were collected from 4 golf clubs, 3 professional caddie education institutions and 8 public institutions in South Korea and 6 golf clubs and 2 professional caddie education institutions in China. The following results were obtained. Although the caddie training in China is conducted over more time and term than in South Korea, it is necessary to have an education program considering golf expertise and quality of customer service. Therefore, the caddie education program in China is composed of golf related education(golf etiquette, golf practice skill), caddie duty training(safety management, customer service and image making), and training for caddie(fitness management, injury prevention, skin care, and cost-saving etc.). In the future, the Chinese golf club industry will has a potential to develop. In order to provide a consistent and systematic education, manual training on caddie education and training on caddie master to manage caddies should be conducted.

Analysis and Corresponding Measures on Subsynchronous Resonance of Series Compensated Transmission for Large-scale Coal-fired Power Base in China

Du, Ning,Song, Rui-Hua,Liu, Chuan-Wen,Chen, Zhen-Zhen,Xiang, Zu-Tao,Ban, Lian-Geng The Korean Institute of Electrical Engineers 2014 The Journal of International Council on Electrical Vol.4 No.2

This paper investigates the risk assessment of subsynchronous resonance for series compensated UHV transmission of Ximeng coal-fired power base, which exemplifies a common problem in the development of the power grid in China. To avoid the problem of huge computational amount of offline analysis on subsynchronous resonance, a new method of online analysis and forewarning based on time-domain simulation is proposed. In addition, various suppression measures are summarized and discussed, as well as combination of multiple measures.

Adaptive Robust Course-tracking Control of Time-varying Uncertain Ships with Disturbances

Rui Wu,Jialu Du 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.7

In this paper, we address the problem of course-tracking for ships with unknown time-varying parameters, completely unknown time-varying control coefficient, and unknown time-varying bounded environmentaldisturbances. Incorporating a Nussbaum function and an adaptive law into the backstepping design method, wepropose a course-tracking control law. The strict stability analysis shows that the designed course-tracking controllaw makes the course-tracking error settle into an arbitrarily small compact and guarantees the global uniform ultimate boundedness of all signals of the resulting closed-loop system by appropriately choosing design parameters. Simulation results and simulation comparisons on two ships demonstrate the effectiveness and the superiority ofthe proposed course-tracking control law.

Synthesis and characterization of core–shell associative polymer that prepared by oilfield formation water for chemical flooding

Rui Liu,Wan-Fen Pu,Dai-Jun Du 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.46 No.-

A novel core–shell polymer (HBAPAM) with functionalized nano-SiO2 as core, multibranched associativepolymeric chains as shell was synthesized through in-situ free radical polymerization strategy. TGA, IR,1H NMR, and SEM proved the notion and method of preparing of HBAPAM was applicable. The core–shellstructure and multibranched morphology enhanced the supramolecular interaction of HBAPAM, whichdisplayed the desirable viscosified efficiency and viscoelasticity, especially, long-term stability in harshtemperature and salinity condition. HBAPAM featured the rheology in multiscale consistently indeionized water and formation water. Coreflooding experiments confirmed that HBAPAM had high costperformance in the variable permeability of oilfields.

A DELAYED SIR EPIDEMIC MODEL WITH NONLINEAR INCIDENCE RATE AND PULSE VACCINATION

Du, Yanke,Xu, Rui The Korean Society for Computational and Applied M 2010 Journal of applied mathematics & informatics Vol.28 No.5

An SIR epidemic model with pulse vaccination and time delay describing infection period is investigated. The global attractiveness of the infection-free periodic solution is discussed, and sufficient condition is obtained for the permanence of the system. Our results indicate that a large vaccination rate or a short period of pulsing leads to the eradication of the disease.

TRAVELING WAVES OF AN SIRS EPIDEMIC MODEL WITH SPATIAL DIFFUSION AND TIME DELAY

Du, Yanke,Xu, Rui The Korean Society for Computational and Applied M 2012 Journal of applied mathematics & informatics Vol.30 No.3

This paper is concerned with an SIRS epidemic model with spatial diffusion and time delay representing the length of the immunity period. By using a new cross iteration scheme and Schauder's fixed point theorem, we reduce the existence of traveling wave solutions to the existence of a pair of upper-lower solutions. By constructing a newfashioned pair of upper-lower solutions, we derive the existence of a traveling wave solution connecting the uninfected steady state and the infected steady state.

A Rapid Field Measurement Method for the Determination of Joint Roughness Coefficient of Large Rock Joint Surfaces

Rui Yong,Xi Fu,Man Huang,Qifeng Liang,Shi-Gui Du 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.1

An accurate measurement of the Joint Roughness Coefficient (JRC) of large rock joints is essential for understanding the mechanical behavior and permeability characteristics of rock mass. Determining the surface roughness of rock joints in situ, however, is timeconsuming and depends on sophisticated instruments. This study was carried out to develop a systematic method of measuring the JRC values of large joint roughness profiles. The roughness profiles were accurately recorded by a hand profilograph in the field and then digitized with flexibly adjusted sampling intervals by the grayscale image processing method. The digitized profiles were correlated closely with the original roughness profiles. A computerized approach for JRC quantitative evaluation was proposed based on the roughness amplitude/joint length relationship with JRC. The interval effect analysis showed that this method was effective for estimating the JRC values of different sized rock joints. This JRC measurement method has been successfully used in a case study of killas rock joints in Changshan City, P.R. China.

Temperature distribution prediction in longitudinal ballastless slab track with various neural network methods

Rui Zhou,Hanlin Liu,Wenhao Yuan,Yanliang Du,Jingmang Xu,Rong Chen 국제구조공학회 2023 Smart Structures and Systems, An International Jou Vol.32 No.2

The temperature prediction approaches of three important locations in an operational longitudinal slab track-bridge structure by using three typical neural network methods based on the field measuring platform of four meteorological factors and internal temperature. The measurement experiment of four meteorological factors (e.g., ambient temperature, solar radiation, wind speed, and humidity) temperature in the three locations of the longitudinal slab and base plate of three important locations (e.g., mid-span, beam end, and Wide-Narrow Joint) were conducted, and then their characteristics were analyzed, respectively. Furthermore, temperature prediction effects of three locations under five various meteorological conditions are tested by using three neural network methods, respectively, including the Artificial Neural Network (ANN), the Long Short-Term Memory (LSTM), and the Convolutional Neural Network (CNN). More importantly, the predicted effects of solar radiation in four meteorological factors could be identified with three indicators (e.g., Root Means Square Error, Mean Absolute Error, Correlation Coefficient of R2). In addition, the LSTM method shows the best performance, while the CNN method has the best prediction effect by only considering a single meteorological factor.

Luminescence and microstructures of Eu³⁺-doped Ca₉LiGd_2/3(PO₄)₇

Du, Fuping,Zhu, Rui,Huang, Yanlin,Tao, Ye,Jin Seo, Hyo Royal Society of Chemistry 2011 Dalton Transactions Vol.40 No.43

<P>A red-emitting phosphor, Eu<SUP>3+</SUP>-doped Ca<SUB>9</SUB>LiGd<SUB>2/3</SUB>(PO<SUB>4</SUB>)<SUB>7</SUB>, was synthesized by the conventional high-temperature solid-state reaction. X-ray powder diffraction (XRD) analyses confirmed the pure crystalline phase of Whitlockite-type structure. The excitation spectra of Eu<SUP>3+</SUP> doped Ca<SUB>9</SUB>LiGd<SUB>2/3</SUB>(PO<SUB>4</SUB>)<SUB>7</SUB> were measured in the VUV and UV region indicating an efficient energy transfer process from the host and Gd<SUP>3+</SUP> to Eu<SUP>3+</SUP> ions. Upon excitation with VUV and UV radiation, the phosphor showed strong red emission around 611 nm corresponding to the forced electric dipole <SUP>5</SUP>D<SUB>0</SUB>→<SUP>7</SUP>F<SUB>2</SUB> transition of Eu<SUP>3+</SUP> ions. The VUV- and UV-excited luminescence spectra of Ca<SUB>9</SUB>LiGd<SUB>2/3</SUB>(PO<SUB>4</SUB>)<SUB>7</SUB>:Eu<SUP>3+</SUP> together with the dependence of the integrated emission intensities on the doping levels were investigated. The Eu<SUP>3+</SUP> ions were investigated by a tunable laser as an excitation source. The excitation spectra of <SUP>7</SUP>F<SUB>0</SUB>→ <SUP>5</SUP>D<SUB>0</SUB> transitions suggest that there are two families of inequivalent sites for Eu<SUP>3+</SUP> in this host. The concentration quenching and crystallographic site-occupancy of Eu<SUP>3+</SUP> ions in Ca<SUB>9</SUB>LiGd<SUB>2/3</SUB>(PO<SUB>4</SUB>)<SUB>7</SUB> host were discussed on the basis of the site selective excitation and emission spectra, the luminescence decay and its crystal structure.</P> <P>Graphic Abstract</P><P>Two families of the inequivalent sites for Eu<SUP>3+</SUP> ions in Ca<SUB>9</SUB>LiGd<SUB>2/3</SUB>(PO<SUB>4</SUB>)<SUB>7</SUB> with whitlockite-type structure were identified on the base of the laser site-selective excitation and emission spectra. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1dt11075f'> </P>

Cervical Cancer Mortality Trends in China, 1991-2013, and Predictions for the Future

Du, Pei-Ling,Wu, Ku-Sheng,Fang, Jia-Ying,Zeng, Yang,Xu, Zhen-Xi,Tang, Wen-Rui,Xu, Xiao-Ling,Lin, Kun Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.15

Background: To analyze cervical cancer mortality trends in China from 1991-2013 and forecast the mortality distribution in future five years (2014-2018), and provide clues for prevention and treatment. Materials and Methods: Mortality data for cervical cancer in China from 1991 to 2013 were used to describe the epidemiological characteristics and distribution, including the trend of the standardized mortality rate, urban-rural differences, and age variation. Trend-surface analysis was used to analyze the geographical distribution of mortality. Curve estimation, time series, gray modeling, and joinpoint regression were performed to predict and forecast mortality trends. Results: In recent years, the mortality rate of cervical cancer has increased, and there is also a steady increase in the incidence from 2003 to 2013 in China. Mortality rates in rural areas are higher than in urban areas. The mortality dramatically increases in the 40+ yr age group, reaching a peak in the >85 yr age group. In addition, geographical analysis showed that the cervical cancer mortality increased from the southwest to west-central and from the southeast to northeast of the country. Conclusions: The incidence rate and the mortality rate are increasing from 1991 to 2013, and the predictions show this will continue in the future. Thus, implementation of prevention and management programs for cervical cancer are necessary in China, especially for rural areas, young women in urban areas, and high risk regions (the west-central).